The theoretical framework for the description of ultrafast processes is based on Non-equilibrium Green Functions (NEGF). NEGF provide an exact approach to describe the quantum kinetics of electrons under the action of ultra-short laser pulses.
Different approximations are employed to make the equations manageable in a first principles code. The resulting equation are then implemented in the real-time module of the yambo code (click on the imagin below).
These activities are developed in the Theory and Simulation Lab. at the Institute of Structure of the Matter of CNR.
Moreover, a theoretical activity based on simple models is carried on, in close collaboration with the theory group of Gianluca Stefanucci at the department of Physics of the Tor Vergata university.